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15 July 2010 Development of the mid-IR echelle high-dispersion spectrograph employing the germanium immersion grating
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Abstract
We have developed a germanium immersion grating mid-infrared cryogenic spectrograph (GIGMICS) designed for the Nasmyth focus stage of NAOJ Subaru 8.2 m telescope, which operates at N-band (8-13 μm) in wavelength with the R ~ 50,000. A single crystal germanium immersion echelle grating (30 × 30 × 72 mm) for collimated beam size of Φ28 mm was fabricated by utilizing ultra precision micro-grinding method coupled with the ELID (ELectrolytic In-process Dressing) technique (Ohmori, H. 1992)1. All optical components are arranged on the 800 mm diameter cold optical base plate (~30 K) of the cryostat. By the Si:As IBC (Impurity Band Conductor) focal plane array (FPA) detector (412 × 512 pixels, unit pixel size 30 μm) operated at 5 K simultaneously acquires ~13 % wavelength coverage for N-band. The instrument has been assembled and is now tested for the application to the gas-phase IR high-resolution spectroscopy.
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Yasuhiro Hirahara, Tsuyoshi Hirao, Yoshio Tatamitani, Tomohisa Yonezu, Noboru Ebizuka, Kentaro Kawaguchi, Hitoshi Tokoro, and Tomomichi N. Oka "Development of the mid-IR echelle high-dispersion spectrograph employing the germanium immersion grating", Proc. SPIE 7735, Ground-based and Airborne Instrumentation for Astronomy III, 77351B (15 July 2010); https://doi.org/10.1117/12.856624
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